3. TROUBLE SHOOTING

3-1 Check of ROM & NMOS-RAM - No calls on the system.

1.Put the 4 "LINK SELECT" switches of the HCU upward (Link No. 15 SELECT) and switch on the AC power of the exchange.

2.If there is no error, no HCU indication lamps will light.

3.In the event of a memory error, the lamps may light as shown in the example of Fig. 1.

4.The error indications will remain on until you use Link No. 15 for communications.

Example

No.1 and No.2 out of 6 pcs

ROMs (2716) have a "read" error.

No.0 and No.1 out of 4 sets of N-MOS RAMs (2114) have a "read" error.

(One set of RAMs consist of 2 ICs)

Indicate memory error.

LINK SELECT Switches set to select No. 15

3-2 Check of CMOS-RAM (Programmed data memory)

At the time of

1.initial programming using station No. 200 and

2.registration of single digit dialing number or personal number made at each station

you hear calling tone instead of confirmation tone if there is CMOS memory error.

(When the system does not work properly and the CPU unit is

considered to be its cause, put the system in the same condition and again operate it using the same CPU to see if

the same problems occur again. In the event of error repetition, change the CPU unit for the new one.)

3-3Indication on front panel of the CPU.

Error ROM • RAM Chip No.

6 5 4 3 2 1 0

Fig. 1

HCU indications

"RUN" LED indicator

When the system is working normally, LED is "on".

Check its condition when the system fails to work normally.

"SELF RESTART" LED indicator

This does not light when the system is working normally. Even if high noise from outside of the exchange

causes the CPU to work abnormally, the CPU "self-restarts" and the system keeps on working normally. Once

the CPU "self-restarts", the LED indicator is on, but it does not affect the system. If you again cycle the AC power

source, the LED indicator is turned off.

– 16 –

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Vizio CPU-56 manual Check of ROM & NMOS-RAM No calls on the system, Check of CMOS-RAM Programmed data memory
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CPU-56 specifications

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The Vizio CPU-56 is equipped with a 56-inch display, delivering vibrant colors and stunning clarity thanks to its 4K Ultra HD resolution. The high pixel density ensures that images are sharp and lifelike, making it ideal for both movie nights and gaming sessions. The television supports HDR (High Dynamic Range) content, allowing for greater contrast and a wider color spectrum, which significantly enhances the visual appeal of movies and shows.

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Overall, the Vizio CPU-56 stands out as an impressive smart television that combines advanced technology, thoughtful features, and user-friendly functionality, making it an excellent choice for consumers seeking an enhanced viewing experience without breaking the bank.
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